you're gonna need an ice type. avalugg with sturdy and avalanche or beartic with icicle crash dewgong is also a good choice because its good sp.defense.
togekiss is probablythe most anoying one of her team with all of her attacks never missing and high flinch chance just get an electric,ice or poison type that outspeeds it with a togekiss only having 80 base speed it shouldn't be that hard.
you might also need a steel-type or a poison-type to deal with her mega altaria or you can try too take it out before it mega evolves altaria has good bulk but it's very slow with only 80 base speed noive
